Abstract
Cancer is a serious health issue and be a principle determinant of the human and economic wealth in a country.
Highlights
Cancer is a serious health issue and be a principle determinant of the human and economic wealth in a country
For accurate dosimetry planning and to reduce the uncertainty of dosimetry data used by the radiotherapy centres, the effective point plays an important role
The experimental results generally demonstrate that the position of Peff in the depth of water phantom of cylindrical ionization chambers cannot be described by a constant shift from the central axis
Summary
Cancer is a serious health issue and be a principle determinant of the human and economic wealth in a country. It is a malignant tumor or an overgrowth of abnormal cells. The motive of illuminating malignant tumor is to deliver a sufficient radiation dose to the target volume. According to the formulation of the cavity theory, the walls of ionization chambers should be water equivalent [1]. Even if the chamber wall is medium equivalent, the volume of water is replaced with the cavity of a cylindrical ionization chamber when the reference point of the chamber at the chamber axis is placed at the depth of measurement
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